Horn.] 



BRACHYDEKINI. 25 



prominent, surrounded by a moderately deep orbital groove. Head short, 

 deeply inserted, hemispherical. Thorax without ocular lobes or fimbricie. 

 Scutellum invisible Mejasternum short, side pieces nearly concealed, 

 sutui'e distinctly visible. Intercoxal process broad, feebly arcuate in front, 

 second abdominal segment as long as the two following united, separated 

 from the first by a straight suture. Anterior and middle tibiie feebly mu- 

 cronate, corbels of hind tibise open, tarsi normal, claws free. 



The general aspect of the unique species is such that, were the scapes of 

 the antenniB long, I would have placed the genus in Otiorliynchini. 



A. nigra, n. sp. 



Elongate oval, Otiorhynchus-like, black, sub-opaque. Head and rostrum 

 as long as the thorax. Rostrum deeply grooved at middle, coarsely punc- 

 tured and glabrous. Antennae piceous. Tliorax cylindrical, as long as 

 wide, sides moderately arcuate, disc convex, surface with coarse closely 

 placed tubercles, each perforated at summit and bearing an indistinct scale. 

 Elytra oval, base feebly emarginate and wider than the thorax, humeri 

 broadly rounded, disc moderately convex, surface with rows of coarse, 

 sub-quadrate punctures, intervals with flattened tubercles each perforated 

 and with an indistinct scale. Body beneath black glabrous, coarsely and 

 densely punctured. Legs black, more sparsely punctured. Length .30 inch ; 

 7.5 mm. 



Two specimens. Mendocino, Cal. 



Group V. Trigronoscnta;. 



Anterior tibine with the outer apical angle prolonged. Articular surfaces 

 of hind tibiae strongly cavernous and scaly. 



TRIGONOSCUTA Motsch. 



Trigonoscuta Motsch. Etudes Entomol. I, 1852, p. 79. 



Rostrum sub-cylindrical, slightly longer and narrower than the head, 

 separated from the head by a fine impressed line, above finely canaliculate, 

 tip truncate. Scrobes deep, arcuate, passing near the lower margin of the 

 eyes. Antennae moderately long ; scape gradually clavate, passing the 

 ej'^es posteriorly ; funicle 7-jointed, 1-2 longer sub-equal, 8-7 obconical, 

 gradually shorter and broader, club oval. Eyes oval, slightly oblique. Tho- 

 rax sub-tranverse, truncate at base and apex. Scutellum small, triangular. 

 Elytra oval (^ or broadly oval 9' humeri rounded. Legs moderate, 

 femora moderately clavate, anterior tibia; dilated at tip, and with the mid- 

 dle tibitB slightly swollen at middle ; hind tibia; very obliquely truncate, 

 the articular surfaces cavernous and scaly. Tarsi spongy and villous be- 

 neath, median line glabrous last joint long, claws moderate, free. Inter- 

 coxal process very broad, slightly rounded in front. Second segment of 

 abdomen longer than the two following united, separated from the first by 

 an arcuate suture. Body seal}' and hairy. 



Tlie supports of the deciduous pieces are not prominent. These pieces 

 are rather long, very feebly arcuate and obtuse at tip. The generic des- 



PROC. AMER. PHILOS. SOC. XV. 96. D 



